Drawing-rolls



(No Model.)

F. H. RICHARDS.

DRAWING ROLLS. No. 505,887. Patented Oct. 3, 1893..

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NITED STATES PATENT OFFICE.

FRANCIS H. RICHARDS, OF HARTFORD, CONNECTICUT.

DRAWING-ROLLS.

SPECIFICATION forming part of Letters Patent No. 505,887, dated October 3, 1893.

Application filed May 21, 1892.

T aZZ whom it may concern.-

Beit known that I, FRANCIS H. RICHARDS, a citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Drawing-Rolls, of which the following is a specification.

This invention relates to the rolls used 'in drawing-heads for reducing slivers of fiber preparatory to the twisting and spinning of the same; the object being to provide improved drawing-rolls which shall be more positive and reliable in their operation than the rolls ordinarily used for this purpose.

In the drawings forming a part of this specification, Figure 1 is a plan view of a pair of drawing-rolls embodying my presentimprovements. Fig. 2 is a side elevation, partially in section, of the drawing-rolls. Fig. 3 is an end elevation of the same, drawn in projection with Fig. 2. Fig.4isa cross-sectional view taken on line a a, Fig. 2, and showing the construction of the rolls more in detail. Fig. 5 is a View similar to Fig. 4, but showing one roll in a dilferent position relative to the other. Fig. 6 is a plan view of the spring in its preferred form. Fig. 7 is a vertical 1ongitudinal section of a drawing-roll of modified construction.

Similarcharacters designate like parts in all the figures.

The lower drawing-r011, B, is fixed upon a driving-shaft, 2, which is carried by bearings formed in the two uprights 3 and 5, respectively, of the frame F. Said lower roll is longitudinally grooved after the ordinary manner of constructing drawing-rolls, to form the series of V-shaped ribs, or teeth, 6, which should be slightly rounded at their outer edges to prevent anycuttingor unnecessaryabrasion of the fiber. The lower roll is positively rotated, through its shaft 2, by the usual means, as for instance, a wheel or gear (not shown) fixed upon the end 8 of said shaft. Thetoproll, C, is carried by an upper shaft, 4, which may be supported in the removable bearinglO and 12; which bearings are set in suitable notches or recesses, formed substantially as shown in the upper ends of the aforesaid uprights 3 and 5, and are retained therein by the ordinary segmentally-flanged holding-screws 7 and 9,respectively. On turning the holding- Serial No. 433,813. (No model.)

screws to loosen the same and bring the flat sides 7 and 9' of the flanges thereof adjacent to the removable bearings 10 and 12, these bearings may belifted out of their seats in awellknown manner. The two rolls are revolnbly supported to engage or mesh the ribs of one roll with those of the other roll for a portion only of the height of the ribs. The top-roll 'C is, in a general way, similar to the roll B, it having a corresponding series of V-shaped ribs, or teeth, 6', similar to the-aforesaid ribs 6 of said roll B. But said top-roll O, unlike the roll B, is fitted freely on its shaft, and is provided with a tension-device intermediate to it and said shaft. For, the purpose of coacting with said tension-device, the roll C has formed therein a key-way, orv groove, 20, for receiving some suitable spring, as 22, whose ends are fixed in holes, formed at and 26, in the shaft 4, as shown in Figs. 2, 4 and 5. Said spring 22 acts after the manner of akey through which power is transmitted to the roll C from the shaft 4. The spring-key 22 being curved as shown in Fig. 6, the rounded side 22 thereof bears against the side 20' of the key-way 20, (Figs. 4 and The operation of the drawing-rolls is as follows: When the rolls are run idle, the rear ward sides of the teeth 6' of the roll 0 should touch or bear lightly against the forward sides of the teeth 6 of the roll B, this roll and the shaft 4 being revolved by gearing in the directions indicated by the arrows thereon in Figs. 4 and 5. When a small sliver, S, is passed through the rolls, as indicated, for instance, in Fig. 4, the teeth of said rolls are separated by a distance, 30, corresponding to the size of said sliver; which distance corresponds to the yielding movement of the roll C on its shaft by reason of the elasticity of the spring 22. In Fig. 5, a larger sliver, S, is shown passing through the rolls, whose teeth are here separated by a larger distance, 30, corresponding to a further yielding movement of the said roll 0 on its shaft. An increase in the size of the sliver correspondingly increases the distance 30 between the teeth of the rolls, and also increases the tension of the spring to grasp the longer sliver more firmly, thus automatically regulating the tension of the rolls to correspond with the power required to operate on the sliver, whether this is (within certain limits) larger or smaller. The upper roll and its shaft is or may be driven from the lower roll by means of a pair of spur-gears, 13 and 15, fixed on said shafts 2 and 4, respectively. The position, circumferentially, of the shafts of said rolls and gears should be such as to bring the V-ribs 6' into proper working position relatively to the V-ribs 6 of the lower roll. As a means for regulating this relation of the respective ribs, I make'the gears 13 and 15 to have one tooth more or less than the corresponding roll has ribs. By means of this construction of the gears to have a variant number of teeth, the relative working positions of the respective roll-ribs may be modified by slipping one of the gears one tooth forward or back, as the case may require, thus adjusting the rolls by a fractional part of the distance between two successive ribs corresponding to the number of teeth in the gear. By this means, the working distance of the V-ribs of one roll may be brought just close enough to the V-ribs of the other roll to properly grasp the sliver in any particular case. For a further description of this feature, (which, however, is not essential to the successful use of my present improvements,) referenceis made to Letters Patent of the United States No. 474,030, granted to me May 3, 1892, for improvements in drawing-rolls.

In Fig. 7 I have illustrated a modified form of the construction of the upper drawingroll, and of the tension'device therefor. Said modified roll is designated by D, and has an internal chamber, or bore, 25, formed therein to receive the coiled spring 26, and

one end of a sleeve, 27, which is fixed to the shaft 28 by means of a set-screw, 29. The spring 26 is coiled about the shaft 28, one end being fixed in the roll D and the opposite end in the inner end of the sleeve 27. By means of this construction, the roll D is permitted to turn slightly on its shaft for the purpose described in connection with the roll 0. As a means for limiting said turning movement, a pair of stop-pins, 32 and 34, are provided, fixed one in the roll D and the other in the sleeve. The pin 32 engages the pin 34 as a stop, in the well-known manner indicated in the drawings. The mode of operation of this form of the roll in the general combination, is the same as described in connection with the preceding figures.

Having thus described my invention, I claim- 1. A pair of drawing-rolls forfibrous materials, consisting of two ribbed rolls revolubly supported to engage the ribs of one roll with those of the other roll, gearing connecting the rolls, and a yielding connection intermediate to one of the rolls and one of the gears, substantially as described.

2. A pair of drawing-rolls for fibrous materials, consisting of a pair of ribbed rolls revolubly supported on geared shafts to engage the ribs of one roll with those of the other roll, combined withayieldin g connection substantially as described intermediate to one roll and its shaft, substantially as described.

3. The combination with one fluted roll and a gear carried by said roll, and with a shaft having a gear meshing with the gear of said first roll, of a ribbed roll loosely mounted on said shaft and meshing with said first ribbed roll, and a roll-actuating springintermediate to the loosely-mounted roll and its shaft, substantially as described.

4. The combination with a pair of intermeshing ribbed rolls, of gearing connecting said rolls, a shaft on which one of said rolls is loosely mounted,and ayielding connection between said shaft and said loosely-mounted roll and adapted to normally turn backward the loosely-mounted roll to bring its teeth in engagement with the forward side of the teeth of the opposite roll, substantially as described.

5. In a pair of dl'awingrolls, the combination with two ribbed rolls revolubly supported to engage the ribs of one roll with those of the other roll for a portion only of the height of said ribs, of mechanism for operatively connecting the rolls, and a spring-bar operatively bearing against one of said rolls for normally holding the ribs thereof in contact with one side of the ribs of the other roll and for increasing the tension on the separation of said ribs by the fibrous material passing through the rolls, substantially as described.

6. In a drawing-roll mechanism, the combination with a framework having bearings for a pair of rolls, of. a pair of fluted drawingrolls mounted in said framework and set to have their teeth intermesh for a portion only of the depth of the teeth, a pair of gears intermediate to and driving the rolls, and a yielding connection .in'position intermediate to one roll and its driving gear for turning said roll relatively to its gear and holding the teeth thereof against the teeth of the opposite roll, substantially as described.

FRANCIS H. RICHARDS.

Witnesses:

HENRY L. RECKARD, HANS MALLNER. 

